and they are "Rokkor", not "Rokker".
a MC Rokker 55 mm f1.7 PF and a Minolta MD 50mm f1.7. Whats the difference?
May I respectfully suggest
The MD lenses were introduced with the XD-11 and in the XD-11 manual it said that you should only use the MC lenses in A or M mode and not S.
I'll add another common misunderstanding -- that MC lenses can't be used in P mode (which, of course, only applies to the X-700).
None of these "incompatibilities" are actually factual. Minolta stated to only use MD lenses, because they couldn't guarantee that it would work with MC lenses -- and they wanted to sell their MD lenses. MC lenses, and even earlier Rokkor lenses, can be used in different auto-exposure modes (M,A,P,S), but it depends on the lens, and the camera, and the mode used.
All you need to do is try any combination out and see if it works. You will probably be pleasantly surprised.
One way to help address the incompatibility is to "super glue" an MD tab onto your non-MD lenses in the appropriate spot on the aperture ring. All this does is indicate to the metering system what the minimum aperture is -- f16/22/32.
For the most complete chart of ALL the 'ole MC, MC Rokkor, & MD lenses, go here: https://www.minolta.easypix.de/lenses/
I'm also a fond user - shooter of my ever-so-trustworthy SRT 101 I've had for two years now, as well as my X700 I got back in '84.
I have an XD-11 and MD and MC lenses but I didn't notice anything perhaps because I never use S mode. I will have to try it out and see.
I now know the differences. The MD lenses have a tab that indicate the minimum aperture of the lens so that the camera can display the aperture in the viewfinder. With MC lenses when in S mode it doesn't display the aperture the camera selected. I knew all of these back in 79 but I don't have the XD-11 until the early part of the 21st century.
Another thing about these two lenses specifically, I recall seeing on Philipp Reeve's website that the 55 has particularly nice bokeh, not that I care much, my most used 50 is the MD III 50 2.0 because it's light and very rectilinear, despite its allegedly terrible bokeh.
I would also expect the newer lens to have slightly better coatings.
I read somewhere that.....
I think it's not lighter but the movement of the aperture stop down lever and the f/stop is more linear so the camera can stop the lens down correctly. I read that the camera would do a stop down metering and adjust the shutter speed if the aperture isn't the correct aperture.Beside the added tab on the MD, I read somewhere that the aperture on MD lenses was made lighter to open faster, which they seemed was needed for shutter priority. This might have only been a problem on very few MC lenses, which could explain why most others work fine. Or maybe it was just marketing to sell more MD lenses...
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